diff --git a/app/assets/javascripts/components/features/compose/components/compose_form.jsx b/app/assets/javascripts/components/features/compose/components/compose_form.jsx
index 273ebd83f3d0bfb1de10409b76d1274f69bd685b..166c5fdcedb14089373db51d84a1395715683f91 100644
--- a/app/assets/javascripts/components/features/compose/components/compose_form.jsx
+++ b/app/assets/javascripts/components/features/compose/components/compose_form.jsx
@@ -173,6 +173,13 @@ const ComposeForm = React.createClass({
           <Toggle checked={this.props.private} onChange={this.handleChangeVisibility} />
           <span className='compose-form__label__text'><FormattedMessage id='compose_form.private' defaultMessage='Mark as private' /></span>
         </label>
+       
+        <Motion defaultStyle={{ opacity: 0, height: 0 }}, style={{ opacity: spring((this.props.private || reply_to_other) ? 0 : 100), height: spring((this.props.private || reply_to_other) ? 0 : 39.5) }}>
+            <label className='compose-form__label' style={{ height: `${height}px`, overflow: 'hidden', opacity: opacity / 100 }}>
+              <span className='compose-form__label__text'><FormattedMessage id='compose_form.privacy_disclaimer' defaultMessage='Warning: Private posts are not encrypted, and could be read or boosted by instances or people who do not respect post privacy. This is not true privacy. Do not post senstive information.' /></span>
+            </label>
+          }
+        </Motion>
 
         <Collapsable isVisible={!(this.props.private || reply_to_other)} fullHeight={39.5}>
           <label className='compose-form__label'>
diff --git a/app/assets/javascripts/components/locales/en.jsx b/app/assets/javascripts/components/locales/en.jsx
index ac1c1a7d53e8597c5e78f3adbbd36acc1a233bc9..d1357227e52cf96c35b4d17e747b9bf328515cb1 100644
--- a/app/assets/javascripts/components/locales/en.jsx
+++ b/app/assets/javascripts/components/locales/en.jsx
@@ -41,6 +41,7 @@ const en = {
   "compose_form.sensitive": "Mark media as sensitive",
   "compose_form.spoiler": "Hide text behind warning",
   "compose_form.private": "Mark as private",
+  "compose_form.privacy_disclaimer": "Warning: Private posts are not encrypted, and could be read or boosted by instances or people who do not respect post privacy. This is not true privacy. Do not post senstive information."
   "compose_form.unlisted": "Do not display in public timeline",
   "navigation_bar.edit_profile": "Edit profile",
   "navigation_bar.preferences": "Preferences",